Etching solution



Patented Aug. 21 1928 .PATEN T OFFICE.

JOHN W. SAUER, OF CHICAGO, ILLINOIS.

ETCHING SOLUTION.

No Drawing.

allof which will be more thoroughly understood from the followingdescription, it being obvious that changes and modifications of theingredients of the formula may be varied without departing from thescope of the appended claims forming a part hereof.

The invention is adapted for use in decorating various articles,particularly those which are cast or otherwise formed and produced ofbrass which, while due to the different compositions of various brasses,results in a decoration in which'the portions thereof differ both as toshade and outline.

hen brass of one character is subjected to the action of the solutionfor a certain period oftime, the decorations produced upon; the surfaceof the article resemble flat facets, which vary in shade, color and alsoshape and size, giving the article a mottled appearance, the facetsbeing defined by straight lines, whereas when brass having differentcharacteristics than that above referred to is subjected to the actionof the solution, the outline of the decorative portions may be of arounded character, which differ in shade relatively to each other andalso, due to the difference in color of the brass, will present adifferent general appearance compared to that previously referred to. 3

One formula whereby a solution capable of resulting in an action andformations such as those hereinbefore referred to includes coppersulphate, nitric acid, muriatic acid,

' ferrous sulphate, and sodium chloride or salt in water, makinga bathin which the article to be decorated is immersed for a suitable period.

'Application filed April 28,

1927. Serial No. 187,412.

The ingredients when added to one gallon of water in the followingproportions and left for substantially one-half day prior to use will,upon subjecting the article to the solution for about one-half hour,accomplish the above result: water, one gallon; copper sulphate, 2ounces; nitric acid, one-fourth ounce; muriatic acid, one-fourth ounce;ferrous sulphate, one-fourth ounce; salt, onehalf pound.

' The copper sulphate, ferrous sulphate and the salt are employed toproduce the different shades and tinge or color to the variousdecorative portions, for instance, the copper sulphate produces a bluetinge, the ferrous sulphate a green tinge, and the salt a lighter tinge.Therefore, it is obvious that these above ingredients may be varied oradded to, to reduce or increase the number of colors which may resultdepending upon desire or necessity.

It is manifest that the action of the solution will vary, depending uponthe particular consistency oricomposition of the brass, and will thusproduce a variation of outline to the etched portions which will resultin the production of different efiects.

Having thus described the invention, what I claim and desire to cover byLetters Patent 1. A solution of the character described acid, muriaticacid, ferrous sulphate, and sodium chloride.

2. A solution of the character described containing water, nitric acid,muriatic acid and ferrous sulphatein equal portions, copper sulphate,and sodium chloride.

3. A solution of the character described containing water, coppersulphate two ounces, nitric acid one-fourth ounce, muriatic acidone-fourth ounce, ferrous sulphate onefourth ounce, and sodium chlorideone-half pound.

In witness whereof, I hereunto subscribe my name this 12th day of MarchA. D., 1927.

JOHN w. SAUER.

composed of water, copper sulphate. nitric

